124.     

Of the 12 temporary employees in a certain company, 4 will be hired as permanent employees.  If 5 of the 12 temporary employees are women, how many of the possible groups of 4 temporary employees consist of 3 women and 1 man?

(A) 22

(B) 35

(C) 56

(D) 70

(E) 105

这题答案是D

不过我一直想不出来思路要怎解

请帮忙THX

我想可能应该是楼主没理解题目什么意思吧，这个题目的意思确实有点绕，我帮你简化下：

从12个临时工里面挑4个成为正式工人，已知这12个工人里面有5个是女的，问你这挑出来的4个工人里面有3女一男的组合的可能搭配有多少种

其实说白了就是C(3,5)*C(1,7) = 70